external/json/cJSON.c : Include stdbool.h for true and false
external/json/cJSON.c : Include stdbool.h for true and false

Without including stdbool.h, there can be build error from true and false.
 error: ‘false’ undeclared (first use in this function); did you mean ‘pause’?
         return false;
                ^~~~~
                pause

Signed-off-by: jeongchanKim <dd29dda359f9c9995ad03eb5d0e774929bcceb5c@samsung.com>

Samsung/TizenRT,Samsung/TizenRT,sunghan-chang/TizenRT,jeongarmy/TizenRT,sunghan-chang/TizenRT,sunghan-chang/TizenRT,Samsung/TizenRT,jeongarmy/TizenRT,sunghan-chang/TizenRT,jeongarmy/TizenRT,jeongarmy/TizenRT,jeongarmy/TizenRT,Samsung/TizenRT,jeongarmy/TizenRT,sunghan-chang/TizenRT,sunghan-chang/TizenRT,Samsung/TizenRT,Samsung/TizenRT,sunghan-chang/TizenRT,Samsung/TizenRT,jeongarmy/TizenRT